Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8323c7804fc665…

MALICIOUS

PDF

97.8 KB Created: 2021-08-30 22:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d80b044df623080bff2fa95d76d0e4a9 SHA-1: 0b93978760056f7c87ad325db04f76e49fcb6068 SHA-256: af8323c7804fc665cf097c6fd4378818fd8e95078a14af6fa70f4eb2e817a2ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ketchas.ru/uplcv?utm_term=the+word+homosexual PDF link annotation
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/90662461130.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/zinapi.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/13bd0f9943275cbc35671b0d3aafaa3d/nobuvilozizejope.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/jnonn7oubke3um48dlvqk8hg16/49883781554.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/13146690939.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/59644cab787932faf9622ca30886734f/pezapadodik.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/93635747091.pdfIn PDF document text
    • http://zzweien.com/d/files/jogewogagoba.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071d8c259b7a---88394327651.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/5020l42mf2v8ps9tasm6uiauib/11033616446.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/fca1245eff2ecd200c4a6a880f1ab969/tejuditalimaxiludilu.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160821aa5cbbb7---temujemo.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/74vv3l8qfnc4fek2s4kg3og8r6/75644995656.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/13401a28b0b81ac893025d9f80e72a57/34776079827.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/586df59d6b7b9449bcd8b4c7ce270585/kojoz.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b417502ef71---jibuje.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/f115596f921d36333d8414ac94fd6e1f/tivokavoxajarusoxizewupab.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/xopopuwegalomojitaxitafe.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/5015771381.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072bfdea369b---70322541755.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/jejin.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfb52d0074---86635125630.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/sujasovawotomowizesetokop.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad852146ece---34982734596.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001130b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130B 20568 bytes
SHA-256: 1b2291993ddfe4996f6d9b28f0bdaa0d9028d0041fde50eee4324a960fbd1cac
font_01_sfnt_off000148d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000160e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160E7 10468 bytes
SHA-256: be70e2827a8542eaaa0c23872d69fe401febfd7fb2e174544db525941a7c4114

Open this report in the interactive analyzer, or submit your own file for analysis.